Use confirm() as a condition to if?

问题:

I have this function:

function RemoveProduct() {     if (confirm("Poista?") == return true) {         return true;     } else {         return false;     } } 

When you click a "remove" button on the page, it should ask if it should remove a product, and if the answer is yes, it will remove it.

But as far as I know, I can't use another brackets on the if sentence conditions? How this should be done?

回答1:

When you compare a return value to true you shouldn't use return true, just true:

function RemoveProduct() {   if (confirm("Poista?") == true) {     return true;   } else {     return false;   } } 

You don't even need to do the comparison, as the result from confirm is a boolean value:

function RemoveProduct() {   if (confirm("Poista?")) {     return true;   } else {     return false;   } } 

And you don't even need the if statement, you can just return the result from confirm:

function RemoveProduct() {   return confirm("Poista?"); } 

Remember to use return when you use the function in an event. Example:

<input type="submit" onclick="return RemoveProduct();" /> 

回答2:

confirm() returns a boolean value and you can return that. Like so:

function RemoveProduct() {     return confirm("Poista?"); } 

回答3:

But as far as I know, I can't use another brackets on the if sentence conditions?

There is nothing that prevents you from executing a function within an if condition. That said, I always get all the arguments to my conditional settled before the if, for clarity and readability.

Here is your code greatly simplified.

var confirmed = confirm('whatever'); return confirmed; 

回答4:

just use

<a onclick="return confirm('ARe sure want to remove');">remove</a> 

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